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  <title>Document</title>
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  <script>
    // JS中的可选链
    //  处理为undefined的气矿
    const list = [

    ]

    // 可选链: 防止因为访问到不存在的属性，而保存
    const name = list[0]?.name
    console.log('name  ----->  ', name);


  </script>

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